Billing systems in telecom are pivotal for the operation of any telecom operator. In this article I explain some of the terminologies about telecom and try to show how they fit in the big picture in telecom operators.

Also I explain the Customer, Network and Money triangle which helps in defining functionalities of the Billing system and maybe IT Applications inside the telecom operator matrix of business processes.

The ideas discussed in this article is intended to be as generic as possible and based on my personal perspective.